BMP3 Converter
FileFlip converts BMP3 files into 61 other formats entirely inside your browser, using ImageMagick, MuPDF and Pandoc compiled to WebAssembly. The BMP3 file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. There is no file-size limit and no account to create.
How do I convert a BMP3 file?#
- Drop your BMP3 file onto the converter at the top of this page, or click it to pick one from your computer.
- Choose the format you want out of it. FileFlip downloads the engine that conversion needs, once, and your browser caches it.
- Conversion starts the moment you pick the format, and the result is yours to download. The work happens in this tab, so nothing is uploaded and nothing is queued.
Is it safe to convert BMP3 files online?#
Yes, because nothing is uploaded. FileFlip converts BMP3 files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What happens to a BMP3 file#
FileFlip converts BMP3 into 61 formats with ImageMagick, MuPDF and Pandoc, all of it inside the browser tab. Each conversion below names the engine it uses, what it downloads, and exactly what that conversion keeps or drops.
| Category | Image Files |
|---|---|
| File extension | .bmp3 |
| FileFlip support | Read and written |
| Conversions available | 61 |
| Engines | ImageMagick, MuPDF and Pandoc |
| Downloaded to your browser | 14.1 MB on the first conversion, then cached |
What is a BMP3 file?#
BMP3 is ImageMagick's name for a Windows bitmap saved with the 40-byte BITMAPINFOHEADER that Windows 3.0 introduced in 1990, an encoding choice rather than a different file format, and it's the header structure the overwhelming majority of ordinary .bmp files already use.
Choose BMP3 for maximum compatibility, since it's the header format nearly all BMP-reading software expects.
Convert away from BMP to PNG when the image needs transparency, or when you want lossless compression smaller than BMP3's largely uncompressed pixel data.
The BMP3 file format reference covers the specification, the programs that open one, and what each conversion keeps or drops.
BMP3 questions people ask#
What is BMP3?
BMP3 is ImageMagick's name for a standard Windows bitmap written with the 40-byte BITMAPINFOHEADER, not a separate format. It's the same header structure that almost every ordinary .bmp file already uses.
Is BMP3 the same as a normal BMP file?
Yes, in practice. Windows has used the BITMAPINFOHEADER as its default bitmap header since Windows 3.0 in 1990, so a plain .bmp saved by most modern software is already what ImageMagick calls BMP3.
Does BMP3 support transparency?
No. The BITMAPINFOHEADER that BMP3 writes has no alpha channel; that was added in later Windows header versions. A BMP3 file is always fully opaque.